Detachable coupling



t Patented July 7tlg-A42 V f Norman lll. Couty, Detroit, Mieli.,assignor to The Flex-O-'lube Company, a corporation of'Dela.-

Application November 1; 1940, serial No. 363,930

mmm. (ci. ess-ss) This invention relates to detachable couplings forflexible hose and the like. e h

As the use of flexiblevhose becomes prevalent in industry, pressurescarried by flexible hose lines are increased. lAs the pressures carriedlby ilexible hose lines increase, the problem of providing adequate.couplinglmeans on the' end or ends of iiexible hose lines' becomes moredifheult. Manysatisfactory coupling means have been' devised wherein the4coupling is crimped or otherwise fixed on the end of a` flexible. hoseat the factory or at a shop particularly equipped to perform thenecessary' crimping or swaging operations. o

nHeretofore, detachable couplings for flexible is threaded from one endand into which a stem 1 I2' is threaded fromV the other end, the saidIstem I2 being simultaneously threaded intoA telescopic relationshiplwithinthe said hosev II as shown v in'Fig. 3.

Thesaid shell I is preferably formed hexagon' at i3. to accommodate awrench andv has a threaded interior I4 ,which is formed at' I5 to ashell I0 is preferably located 4centrally along the restricted internaldiameter. The said restricted internal diameter I5 of the internallythreaded [said internally threaded portion lil thereof-as .hose have'notbeen employed except at low presl sures, say from 100 to 45,000 lbs, persq. inch i inasmuch as it has been lfound that, when those pressures areexceeded, the,usu al detachable'coupling means employed would leakorpart from I the hos@ BY .fdetchble couplingmeans" it is meant acouplingy which maybe secured to and removed from the end 'of a,flexible tube or hose without employing" tools other` than standardwrenches or a vise and a wrench.

With the foregoing'. in view, it is the primary object of the inventionto yprovide a detachablel coupling which maybe applied to and removed'drum a .flexible hose or the like by employing simple readilyavailablehand-tools and which will withstandwithout' leaking or parting extremelyhigh pressures.

Another object of the invention is provide" /aninexpensive-to-manufacture and readily applicable dtachable `couplingmeans for` flexible horsev a'nd the like wherein'the coupling meansaffords a minimum of restriction for the passage of fluids through thecoupling and hose.

Other objects of the invention will becomeapparent by reference. to thefollowing detailed description taken in connection with the accompanyingdrawing. in which: Fig. l is an exploded sectional view showing adetachable coupling embodying the invention. Fig. 2 is a partiallyassembled sectional view of the detachable coupling disclosed in Fig.l.-

- Fig. 3 is a fully 'assembledsectional' view of the detachable'coupling'disclosed in Figs. 1-and2.

Referring now tothe drawing wherein like numerels `refer to likeandcorresponding parts throughout the several views,yand with particularreference' to Figs. 1, 2 and 3, the dtachable coupling embodying 'theInvention disclosed therein comprises, `in' general, a .shell .I0 intowhich a ilexiblescmewhat compresslblehose II` withstand pressures from11,0000 to 15,000-lbs.

' sure'through a restricted annular space between f lindicatedin'lig.y 1. I'hesaid'shell I0 has a smaller internally threaded en'dportion I6 into and throughwhich the stem I2 may be threaded. Ashoulderv I1 is formed at the base of the in- .ternally threaded portionI'4 of the shell I0 against which the -end of the ilexible hose II labuts when 'threaded Within the said shell It,

The said stem I2 hasia hexagon portionl formed integral therewith toaccomrriodatev a wrench or the like and hais the outer end thereofformedy and threaded as a maleftting member I0, or, the outer end or thesaid stem. l2 may lbe formed and internally threaded as4 a femaleflttingmemberif desired. fs

When the flexible hose II-is threaded intol the l larger end of theshell I0, the outer and inner periphery of the said hose 'II follow thecontour of the internally threaded restricted portion l5 of the shell'I0 causing the`internal periphery of of the'hos II to be restricted ina like manner as indicated at the numeral 20 in Fig. 2. y Alfterthe hosevII and shell I0 have been assembled-asindicated in Fig, 2, the stem I2isy threaded into -theinternally threaded end Il .of

the said shell Ill and simultaneously into the end vof the hose II..which `compresses the Said .hose II at the restricted portion 20 thereofcreating a positive,` leakproof and part-proof detachable coupling .asshown in Fig. 3 that will per sq. inch without leaking or.. parting. It.will

be noted that, by restricting the internal diameter of the 'largeinternally threaded eric` I4 0f the shell It at I5, the end of theeigible hose II must be forced or pulled by internal presthe 'shell -IIIand the lstem I'2 before the hose II will part from thedetachablecoupling under pressure.

In wm be noted by reference to Fie-2 that 4. .'lthe extreme 'end of theflexible hose Il does not protrude radially inward over the aperture 'ofthe internally threaded endportion I6 and block the entry' or the end ofthe stem lz into the said iiexiblel hose Il.

a maximum restriction substantially at the 1ongitudinal center of theinternally'threaded portion il thereof and tapering the said Arestricisaccomplished by v the gradual restriction of' the said .shell Il toshell 'lli and stem i2 which, is accountable for the extremely highpressures rwhich the novel= tting will withstand without leaking orparting. This is accomplished in a detachable 'type coupling by' theemployment of ya shell -Iii having an internally threaded portion i4into which the hose Ii is threaded which is restricted in internaldiameter so as to restrictvv the internal diameter ofthe hosethreadedlth'erein and by the threading or otherwise urging into thelsaid hose, after it has been lthreadedeinto the shell .|0, a stein` twhich compresses the said hose Il and wedges it in the said shell I0 insuch a manner that the end of the said hosey Il must be pulled through arestricted annular space in order to be parted l from the tting. l

Although but one embodiment of the invention has been disclosed anddescribed in detail, it is obvious that many changes may be made inthesize, shape, arrangement and detail of the^` invention without'departing from the spirit and. in the appended scope of the invention asdeiined claim.

I claim: t

A detachable coupling for flexible hose comprising a shell member`internally threaded at one end the greater portion of its lengtho acycommodate a flexible hose and internal-1y threaded at the otherl end toaccommodate a stem member forming a shoulder therebetween, a. stemmember including a substantially cylindrical externally threadedstemportion equall to or slightly larger in diameter than the internaldiameter `of said hose, the`outer end ofv the' saidvstem member being'formed to serve as a coupling, the internally threaded portion oi' saidshell member which accommodates said hose havingits threads of,uniformdepth and being formed tapered to a`restricted internal diametersubstantially at the longitudinal center between its outer end and saidshoulder to provide a restricted annulary areav between said shellmember and the said externaily threaded stem of the said stem memberwhereby when said stem member is inserted in said hose, said threads arepressed'to a uniform depth into the material of the hose ythroughout thelength vof the shell. v v

. NORMAN M. COUTY.

